Class PrivateInterfaceMethodExamples

java.lang.Object

net.jrodolfo.java_evolution.java09.PrivateInterfaceMethodExamples

public class PrivateInterfaceMethodExamples
extends Object

Demonstrates private methods in interfaces, introduced in Java 9.

Java 8 introduced default methods, which allowed interfaces to provide behavior. The missing piece was private helper logic: without Java 9, common code shared by multiple default methods had to be duplicated or exposed as a public interface method.

Java 9 solved this by allowing private and private static methods in interfaces. Default methods can now share implementation details without adding those helpers to the public API.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PrivateInterfaceMethodExamples.DefaultMessageFormatter	Empty implementation that receives behavior from interface default methods.
static interface	PrivateInterfaceMethodExamples.MessageFormatter	Interface with default methods that share private helper logic.

Constructor Summary

Constructors

Constructor	Description
PrivateInterfaceMethodExamples()

Method Summary

Modifier and Type	Method	Description
PrivateInterfaceMethodExamples.MessageFormatter	formatter()	Creates a formatter that inherits default methods using private interface helpers.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PrivateInterfaceMethodExamples

public PrivateInterfaceMethodExamples()

Method Details

formatter

public PrivateInterfaceMethodExamples.MessageFormatter formatter()

Creates a formatter that inherits default methods using private interface helpers.

Returns:

a formatter implementation